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BACKGROUND: Facial clefts are common birth defects with a strong genetic component. To identify fetal genetic risk factors for clefting, 1536 SNPs in 357 candidate genes were genotyped in two population-based samples from Scandinavia (Norway: 562 case-parent and 592 control-parent triads; Denmark: 235 case-parent triads). METHODOLOGY/PRINCIPAL FINDINGS: We used two complementary statistical methods, TRIMM and HAPLIN, to look for associations across these two national samples. TRIMM tests for association in each gene by using multi-SNP genotypes from case-parent triads directly without the need to infer haplotypes. HAPLIN on the other hand estimates the full haplotype distribution over a set of SNPs and estimates relative risks associated with each haplotype. For isolated cleft lip with or without cleft palate (I-CL/P), TRIMM and HAPLIN both identified significant associations with IRF6 and ADH1C in both populations, but only HAPLIN found an association with FGF12. For isolated cleft palate (I-CP), TRIMM found associations with ALX3, MKX, and PDGFC in both populations, but only the association with PDGFC was identified by HAPLIN. In addition, HAPLIN identified an association with ETV5 that was not detected by TRIMM. CONCLUSION/SIGNIFICANCE: Strong associations with seven genes were replicated in the Scandinavian samples and our approach effectively replicated the strongest previously known association in clefting--with IRF6. Based on two national cleft cohorts of similar ancestry, two robust statistical methods and a large panel of SNPs in the most promising cleft candidate genes to date, this study identified a previously unknown association with clefting for ADH1C and provides additional candidates and analytic approaches to advance the field.
Alcohol Dehydrogenase/genetics, Case-Control Studies, Cleft Lip/genetics, Cleft Palate/genetics, DNA-Binding Proteins/genetics, Female, Fibroblast Growth Factors/genetics, Genome-Wide Association Study, Homeodomain Proteins/genetics, Humans, Infant, Newborn, Interferon Regulatory Factors/genetics, Lymphokines/genetics, Male, Platelet-Derived Growth Factor/genetics, Polymorphism, Single Nucleotide, Scandinavia, Transcription Factors/genetics
Published Article/Book Citation
The definitive version was published in PloS one, 4:4 (2009) pp.e5385-. DOI:10.1371/journal.pone.0005385.
Author posting. Copyright © the authors, 2009. This article is posted here by permission of PLOS ONE for personal use, not for redistribution.